This route leads to the south summit, the higher of the two ends of Tresidder's long, thin ridgetop. Start from the Cathedral Lakes Trailhead on Highway 120 in Tuolumne Meadows. Hike 4 miles south, past Cathedral Lakes. The trail begins to head downhill, and Tresidder looms high on your right (west). Climb the class 2 slopes just south of the south summit. The start of the South Arete is on the southwest side of the summit blocks.
You can also climb to the ridge between the north and south summits, then down the west side to reach the start of the route, but this way is longer and more difficult (class 3 in places).
Once at the base of the climb, it takes only about 5 minutes to reach the top. Climb to the left (west) side of the arete at the start, up a chimney-ramp. At the top, cross over some large blocks to the east side of the arete, traverse right about 20 feet, climb some class 4 cracks, and follow a series of rather large blocks up to the summit.
There is no register on the summit (as of Sept 2000).
None needed, unless to increase courage by providing a belay. There is a great belay position at the summit between large summit rocks. If using a rope, watch for friction on the rope as you cross the arete and climb the final blocks.
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